/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gao.flying.mq.connection;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Queue;
import javax.jms.QueueReceiver;
import javax.jms.Topic;
import javax.jms.TopicSubscriber;

/**
 * JMS MessageConsumer decorator that adapts all calls to a shared MessageConsumer instance underneath.
 *
 * @author Juergen Hoeller
 * @since 2.5.6
 */
class CachedMessageConsumer implements MessageConsumer, QueueReceiver, TopicSubscriber {

    protected final MessageConsumer target;

    public CachedMessageConsumer(MessageConsumer target) {
        this.target = target;
    }

    public String getMessageSelector() throws JMSException {
        return this.target.getMessageSelector();
    }

    public Queue getQueue() throws JMSException {
        return (this.target instanceof QueueReceiver ? ((QueueReceiver) this.target).getQueue() : null);
    }

    public Topic getTopic() throws JMSException {
        return (this.target instanceof TopicSubscriber ? ((TopicSubscriber) this.target).getTopic() : null);
    }

    public boolean getNoLocal() throws JMSException {
        return (this.target instanceof TopicSubscriber && ((TopicSubscriber) this.target).getNoLocal());
    }

    public MessageListener getMessageListener() throws JMSException {
        return this.target.getMessageListener();
    }

    public void setMessageListener(MessageListener messageListener) throws JMSException {
        this.target.setMessageListener(messageListener);
    }

    public Message receive() throws JMSException {
        return this.target.receive();
    }

    public Message receive(long timeout) throws JMSException {
        return this.target.receive(timeout);
    }

    public Message receiveNoWait() throws JMSException {
        return this.target.receiveNoWait();
    }

    public void close() throws JMSException {
        // It's a cached MessageConsumer...
    }

    @Override
    public String toString() {
        return "Cached JMS MessageConsumer: " + this.target;
    }

}
